Process of manufacturing continuous lengths of vulcanized rubber combined with ebonite.



T. GARE PROCESS OF MANUFACTURING CONTINUOUS LENGTHS 0F VULCANIZED RUBBER COMBINED WITH EBGNITE.

APPLICATiON FILED MAR. 26. 1912.

Patented July 13, 1915..

TEGMAS GARE, 0F BIRMINGHAM, ENGLAND PROCESS G1 BEANUFACTUBING CONTINUOUS LENGTHS 01E VULCANIZE D RUBBER COMBINED WITH EBGNITE.

Specification of Letters Patent.

Patented July 13, lfllfi.

Application filed March 26, 1912. Serial No. 686.322.

To all whom it may concern:

Be it known that I, Tuou as GARE, subject of the King of Great Britain, residing at Birmingham, in the county of Warwick, England, have invented certain new and useful Improvements in Processes of lllanufacturing Continuous Lengths of Vulcanized Rubber Combined with Ebonite; and l do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

. more expeditiously and uniformly thanhitherto has been the case.

i According to this invention, the powdered rubber and the powdered cbonite (or its equivalent, powdered rubber mixed with sulfur) are separately fed into the mouth of the mold and kept isolated until most of the air is expelled by the compression, when the two separate bodies come into contact within the mold and become fully compressed as they travel onward as one body for partial or complete fusion or conversion in the heated part of the mold In the accompanying drawing Figure l is avcrtical longitudinal section of so much of the apparatus as is necessary for the an derstanding of the invention. Fig. 2 is a plan view of the lower portion of the mold (the topportion being removed) the mold being designed for the production of motorbus tiresof the type shown in Fig. 3 in which an inextensihle metal band is in6orporated in the base of the tire. and covered on both sides with hard rubber or ehonite. Fig. 4 shows one form of mechanism for supplying the rubber and eboni'te in the desired proportions.

Similar letters refer to similar parts throughout the several views.

Referring to Figs. l, 2 and 3, the rubber body a of the tire and its hard rubber or ebonite base 7) are manufactured first by compressing the rubber part at and the ebonite part b separately but simultaneously in the mold and then permitting the two parts to come together before the final compression and become inscparably united as a result oi the process horeinbefore referred to. For this purpose, the mouth of the mold c is provided with a separating plate or table (I and the ram 0 is divided or bifurcated so as to work upon both sides of the plate or table. Preferably the ram is formed as shown in Fig. l with the upper part cut away and a tongue 7' attached to serve as the upper ram.

The powdered rubber is fed to the open end or mouth of the tubular mold through a suitable hopper f] and the powdered ebonite. or its equivalent, is fed through a separate channel or hopper 1 2, to the upper side oi the plate or table (7. so that each stroke of the twin ram 0, f carries forward the charges and compresses them against the previously compressed charges in the mold.

The plate or table 1/ may extend any suitable distance into the mold so long as it permits the two bodies a and 7) to come into contact before they reach the heated part of the mold: in praurtiec, it is found convenient to have the plate or table extending a distance a little farther (say a quarter or half an inch) than the limit reached by the ram.

As the molded tire is extruded from the apparatus. it is preferably wound upon a drum or otherwise given a curvature approximating that of the wheel for which the tire is designed. mentioned tire is. designed to produce a longitudinal groove or grooves or rabbetcd surtaco such as shown in Fig. 3 in the base of (71' the joint may be welded before the tire is placed in said circular tire mold.

Preferably the metal band 2' is previously prepared by having its inner and outer surfaces coated with rubber solution and lightly dusted with powdered ebonitc or rubber. A thin layer Z: of cbonite or its equivalent may be applied to the inner side of the ring or hand during or prior to the circular tire The mold for the above 1, process, to serve ilie purpose of packing and thus to insure ifilic hand seating itself firmly upon the rim of the Wheel.

'lliu tzililv r! use?! with? ilui; shewu, it czui be. uluig curi'm'l'ui' (ZOITUgaiCGCl i cross so (in t0 suib section 0f tha ti #2 or thes s of L l/ thereof.

in order m ubtaii :1 feed which. will 1'PgI1-.

supply the requisii'u propm'liuus of suit illilml and hard Till} lwi'. m- 'l)i lill\ I u my giugiloy the uurchuuisu'i shown in l ig'. l.

Th 'Lwu hoppers 5/ uml 2 an; (llVl(l'U(l by 21 spur j) uml uui'h iu'm'i-ilmi with :i buii'mu having: :1 hole 1 mu! 1' .i a .5 i (-i;iwly, siiiie sis pruYiih-(i hvluw ihe Hui-l bottoms and has two 11010:; i uiul 21-. H i; fiiiiil rests nu the parts a mid u". ll'huii lluxslide .5: is; IOClPK'G- i-ait'wl the holes 25 uiul in (mm ino n: 43? with lire holvs 1 :uul w mu! the: two kinds of uuilwiul ill {hi i'muivz" hul s; WiHE'PHPOH the um'km'iul in flu-s0 .hnlvs f uuii Ii Cui'i'iu'l beyoiul the parts '1' and 1/ {Bid falls either below in :ihm'e (he dividing plum 117 in {\(L'mdmice with ihc positions m ilu guide plates 81 :uul 'I By ulibz'iug the sin of ihe holes a and u the two uiutuiiuls may he led in any pi-u mi'tious. Th0 huh: f uml u may be i'uiuuwl zuljustulile in wins. :15 will. he 'czul'ilj' understand. I

ll; will bu uuilm'slmul that tliu invention is upplivubh 'lur lho umuul'iu'tuio of articles nthm than fir cu WiHl'Li]! mutiuuuuzs lengths oi i'uhlwicuuibiuml will: vhuiiiic are 11% quii'ed.

I claim:

1. The l misting of first separately feeding powdered rubber and ebunii'e puwder t0 the inlet 052' a tubular single bore moid if!) hike up separatu superposeiil. positions. "(lieu intermittently li'mu each other jointly intc the said mold, then allowing the said two powders to (301118 into mntuct with each other in their superposa d positiuus and at the same time subject'- ingtheui to intermittent pressure. to form a, cuuipncii douse muss while cold and finally subjecting tiu: amid mass in the sui l amid *co liflill; for cmuplete fusinu therein, suhstam tiuliy and for the purpose specifier}.

.2. The hereinbelmu described process all illiliillfiuilfl'lfifjf continuous lengths of vuluuizml rubber coiubiuedwith ebonite sou sisiiug of first iufiai'mitlmitly sopa 'ately i'mw'iiug po'irrlez'm'l i'uhhm' z'imi ebonite pow- @873 in :he requisite accurate relative proportions to the inlet 0f a tubular single hoi'e mold to take up Sammie superposed posiiimis than intermittently pressing the said two powders still juiuily, info the Silitl mold. lheu nllmiug the said tsm pmi'dairs in cums into COD'i'flLlZ with vrwh uthei' in their superposed positions and at the same time suliji-rtiug them to inter-- milk-iiipressure is form a compact dense muus while culd and finally subjecting the said mass in the said mold to heat for com plviv fusion therein. suhslzmtiully 21S and for Hi0 purpose Spifi'liiiil.

in iustiuu'my whereof I hui'e uflixeii uutui'c in gii'usuuccof iivu witnesses.

Tl l( )MA 5 GARE.

Hutu.

sing the said two powders still sspuratecl i separated min each ether 

